How often do you change your screens?

[wil86]

I don't have a set time period, but once they are totally blacked up and air doesn't pass though easily.

Yeah same here, when hardly any smoke will pass through it, thats when i change it.

wil86 Reviewed by wil86 on 09-06-2007. How often do you change your screens? If and when you use them.. Rating: 5